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Old 10-13-2009, 12:33   #1 (permalink)
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confused 1998 ford Expedition 4x4 isn't working

I have a 98 Expedition and the 4x4 will not engage. When I shift it from 2wd to 4wd the light comes on but dose not engage. When I shit it from 4wd to 4wd low it will shift into low gear but not the front wheels. Any help?
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Old 10-13-2009, 13:18   #2 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

4 words; Vacuum Activated Autolocking Hubs.

It could be something as simple as a vacuum line that's been pulled off. On your model year when they lose vacuum they go into unlock mode, on subsequent years lost of vacuum cause the hubs to lock.
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Old 10-13-2009, 20:46   #3 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

Where would I start to look? Any idea?
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Old 10-13-2009, 21:26   #4 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

Look at the vacuum lines from the engine down. They can get knocked off, so look closely.
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Old 10-13-2009, 21:42   #5 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

<BR>
This diagram will explain it better;
http://www.warn.com/powertrain/image...VLH%202006.PDF
<BR>
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Old 10-14-2009, 05:02   #6 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

Thanks guys, I will let you know what I find
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Old 10-14-2009, 17:49   #7 (permalink)
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confused Re: 1998 ford Expedition 4x4 isn't working

I just wanted to add that I have an xlt 4.6 and it also has the awd setting when I looked at the diagram on the fan shroud it didnt have anything on it about the 4x4, when i got under and took a look at it i think i have an electric shift motor could that be it? if it is a vaccum line where would i look?
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Old 10-14-2009, 18:08   #8 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

I don't think the 98 Expeditions had vacuum shifting. GM vehicles had. It's probably the shift motor, they have had problems with them. Tomorrow I'll have access to info about it and post more.
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Old 10-14-2009, 18:15   #9 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

Thanks for the help if you wouldn't mind sending it to my email it is jbrunsvig@gmail.com I have been looking at my haynes manual and it looks like an easy swap just let me know if you think it might be something dif or if there is some way to test the motor once again thank you!
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Old 10-19-2009, 09:02   #10 (permalink)
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Re: 1998 ford Expedition 4x4 isn't working

Well I checked the transfer case motor and that worked fine. all of the vaccum lines looked to be fine. now what?
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